- SlateCore\Public\Types\PaintArgs.h
/**
* SWidget::OnPaint and SWidget::Paint use FPaintArgs as their
* sole parameter in order to ease the burden of passing
* through multiple fields.
*/
class SLATECORE_API FPaintArgs
{
public:
FPaintArgs( const SWidget& Parent, FHittestGrid& InHittestGrid, FVector2D InWindowOffset, double InCurrentTime, float InDeltaTime );
FORCEINLINE FPaintArgs WithNewParent(const SWidget* Parent) const
{
checkSlow(Parent);
return WithNewParent(*Parent);
}
FORCEINLINE_DEBUGGABLE FPaintArgs WithNewParent(const SWidget& Parent) const
{
FPaintArgs Args = FPaintArgs(Parent, this->Grid, this->WindowOffset, this->CurrentTime, this->DeltaTime);
Args.LastHittestIndex = this->LastHittestIndex;
Args.LastRecordedVisibility = this->LastRecordedVisibility;
Args.LayoutCache = this->LayoutCache;
Args.ParentCacheNode = this->ParentCacheNode;
Args.bIsCaching = this->bIsCaching;
Args.bIsVolatilityPass = this->bIsVolatilityPass;
return Args;
}
FPaintArgs EnableCaching(const TWeakPtr<ILayoutCache>& InLayoutCache, FCachedWidgetNode* InParentCacheNode, bool bEnableCaching, bool bEnableVolatility) const;
FPaintArgs WithNewTime(double InCurrentTime, float InDeltaTime) const;
FPaintArgs RecordHittestGeometry(const SWidget* Widget, const FGeometry& WidgetGeometry, int32 LayerId) const;
FPaintArgs InsertCustomHitTestPath( TSharedRef<ICustomHitTestPath> CustomHitTestPath, int32 HitTestIndex ) const;
FHittestGrid& GetGrid() const { return Grid; }
int32 GetLastHitTestIndex() const { return LastHittestIndex; }
EVisibility GetLastRecordedVisibility() const { return LastRecordedVisibility; }
FVector2D GetWindowToDesktopTransform() const { return WindowOffset; }
double GetCurrentTime() const { return CurrentTime; }
float GetDeltaTime() const { return DeltaTime; }
bool IsCaching() const { return bIsCaching; }
bool IsVolatilityPass() const { return bIsVolatilityPass; }
const TWeakPtr<ILayoutCache>& GetLayoutCache() const { return LayoutCache; }
FCachedWidgetNode* GetParentCacheNode() const { return ParentCacheNode; }
private:
const SWidget& ParentPtr;
FHittestGrid& Grid;
int32 LastHittestIndex;
EVisibility LastRecordedVisibility;
FVector2D WindowOffset;
double CurrentTime;
float DeltaTime;
bool bIsCaching;
bool bIsVolatilityPass;
TWeakPtr<ILayoutCache> LayoutCache;
FCachedWidgetNode* ParentCacheNode;
};
尚不理解该类的作用，需要后续调试。
- SlateCore\Public\Textures\SlateIcon.h
/**
* Struct used to represent an icon in Slate
*/
struct SLATECORE_API FSlateIcon
{
/**
* Default constructor (empty icon).
*/
FSlateIcon( );
/**
* Creates and initializes a new icon from a style set and style name
*
* @param InStyleSetName The name of the style set the icon can be found in.
* @param StyleName The name of the style for the icon (assumes there may also be a ".Small" variant)
*/
FSlateIcon( const FName& InStyleSetName, const FName& InStyleName );
/**
* Creates and initializes a new icon from a style set and style name
*
* @param InStyleSetName The name of the style set the icon can be found in.
* @param StyleName The name of the style for the icon
* @param InSmallStyleName The name of the style for the small icon
*/
FSlateIcon( const FName& InStyleSetName, const FName& InStyleName, const FName& InSmallStyleName );
public:
/**
* Compare 2 slate icons for equality
*/
friend bool operator==(const FSlateIcon& A, const FSlateIcon& B)
{
return A.bIsSet == B.bIsSet && A.StyleSetName == B.StyleSetName && A.StyleName == B.StyleName && A.SmallStyleName == B.SmallStyleName;
}
/**
* Compare 2 slate icons for inequality
*/
friend bool operator!=(const FSlateIcon& A, const FSlateIcon& B)
{
return !(A == B);
}
public:
/**
* Gets the resolved icon.
*
* @return Icon brush, or FStyleDefaults::GetNoBrush() if the icon wasn't found.
* @see GetSmallIcon
*/
const FSlateBrush* GetIcon( ) const;
/**
* Optionally gets the resolved icon, returning nullptr if it's not defined
*
* @return Icon brush, or nullptr if the icon wasn't found.
*/
const FSlateBrush* GetOptionalIcon( ) const;
/**
* Gets the resolved small icon.
*
* @return Icon brush, or FStyleDefaults::GetNoBrush() if the icon wasn't found.
* @see GetIcon
*/
const FSlateBrush* GetSmallIcon( ) const;
/**
* Optionally gets the resolved small icon, returning nullptr if it's not defined
*
* @return Icon brush, or nullptr if the icon wasn't found.
*/
const FSlateBrush* GetOptionalSmallIcon( ) const;
/**
* Gets the name of the style for the icon.
*
* @return Style name.
* @see GetStyleName, GetStyleSet, GetStyleSetName
*/
const FName& GetSmallStyleName( ) const
{
return SmallStyleName;
}
/**
* Gets the name of the style for the icon.
*
* @return Style name.
* @see GetSmallStyleName, GetStyleSet, GetStyleSetName
*/
const FName& GetStyleName( ) const
{
return StyleName;
}
/**
* Gets the resolved style set.
*
* @return Style set, or nullptr if the style set wasn't found.
* @see GetSmallStyleName, GetStyleName, GetStyleSetName
*/
const class ISlateStyle* GetStyleSet( ) const;
/**
* Gets the name of the style set the icon can be found in.
*
* @return Style name.
* @see GetSmallStyleName, GetStyleName, GetStyleSet
*/
const FName& GetStyleSetName( ) const
{
return StyleSetName;
}
/**
* Checks whether the icon is set to something.
*
* @return true if the icon is set, false otherwise.
*/
const bool IsSet( ) const
{
return bIsSet;
}
private:
// The name of the style set the icon can be found in.
FName StyleSetName;
// The name of the style for the icon.
FName StyleName;
// The name of the style for the small icon.
FName SmallStyleName;
// Whether this icon has been explicitly set-up.
bool bIsSet;
};
问题列表：
a. FSlateBrush是什么，有何作用.
